Alternating current motor



Aug. 30, 1932. v. G. APPLE ALTERNATING CURRENT MOTOR Filed Deo. 11. 1950l f l `Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE VINCENT e.una, or DAYTON, omo ALTERNATING CURRENT noron applicati@ med nember 11,1930. serial 1ro. 501,578.

lhis invention relates to alternating curthe central opening 13 and areseparated by rent motors, and particularly to alternating teeth 16. Toadapt the core to a bipolar current motors having the stator core andwinding two of the teeth are eliminated and coils imbedded in amass ofinsulation which bosses 17 are substituted therefor. To 5 forms thehousing for the motor. facilitate starting the motor two of the teeth uAn object of the invention is to so arrange carry the shading coils 18.the end turns of the stator coils and so mold he main winding comprisestwo coils 19, the end wall .of the housing about the said each made upof three interconnected parts, end turns as to shorten the completedstructhe'end turns 20, 21 and 22 of which, at the ture considerably,thus providing motors bottom of the core, (see Fig. 2') are laid one .oadapted to situations in which length is a conabove the other, while theend turns 20a, 21a sideration. and 22a, at the top of the core, (seeFig. 3)

Another object is to form the housing of are laid side by side, theobject being t0 my motor of an impervious insulation and i throw the endturns back clear of the diamimbed the stator core therein and completelyeter of the central opening 13 at the bottom enclose the stator windingsin the wall of of the core Fig. 2, but to allow them to cross saidhousing then employ a rotating element the central opening at the topFig. 3. which] requires no commutator nor brushes, In the finishedstructure a rotor may be to the end that large Ventilating openingsentered between the pairs of end turns 20, 21

may be made through the housing wall, norand 22 at the bottom of thecore but not from mally for air circulation, but through which the top.By arranging the winding as shown a considerable volume of water orother forin Figs. 2 and 3 the axial length of the motor eign substancemay pass with no injurious is shortened an amount equal to the'lengthresults. taken by the coil sections 21 and 22 at the 25 I attain theseobjects in the structure herebottom end of the core. Tapped metalterinater described and shown in the accomminals 23 are attached, one toeach end of the panying drawing wherein` winding for conveying currentfrom the line.

Fig. 1 shows the stator core of my motor The structure as it appears inFigs. 2 and 3 with shading coilsaround two of the teeth. may be broadlydesignated by the numeral 24. Fig. 2 shows the core as viewed from theFig. 4 shows the structure 24 in a mold 25 bottom when the completewindingis in place. with a body 26 of insulation molded about Fig. 3shows the core as viewed from the the end turns 20, 21 and 22, extendingdowntop when the complete winding is in place. wardly through thetubular rivets l2, be- Fig. 4 shows the core Figs. 2 and 3, bottom tweenand about the end turns 20a, 21a and up in a mold in which insulationhas been 22a. The end turns 22a are spaced apart compressed about thecore and winding, the sufficiently to allow the bearing bushin 26 tosection through the stator being as though go between them and be held1n place y the taken at 4-4 of Fig. 5. stud 27 of the mold while moldingis being g A Fig. 5 is a top plan v1ew of the completed effected. Spaceis also made between end motor. turn 22a for the Ventilating openings28. 90

Fig. 6 is a vertical axialsection taken at (See Figs, 5 and 6.) Theterminals 23 are l6`6 of Fig. 5. also supported in the mold while moldinis Fig. 7 is a, vertical axial section taken at taking place by pins(not shown) enterin 7-7 of Fig. 5. laterally through the side wall 29 ofthe Similar numerals refer to similar parts mold. Because the two bosses17 are shorter 95 throughout the several views. than the teeth 16 thereare left two spaces The stator core 10 comprises a plurality which areiilled by struts 31 of insulation, of laminae 11 held together bytubular rivets (see Fig. 6) which connect the heavier masses largecentral opening 13 is provided at the ends of the core. The insulationalso 0 fora I'OOI'- Winding apertures 14 SUI'I'Olllld flows throughthose portions of the winding 100 apertures not filled by the winding,forming covers over the coil sides 30, as at 32, Fig. 7

The axial section Fig. 6 shows a squirrel cage rotor 33 with theinductors 34 and end rings 36 mounted on a shaft 37. A small Washer 38is staked to the shaft at the upper end of the core and a largerstamping 39 at the lower end to hold the core against endwise movementon the shaft. The stamping 39 has impeller blades 41 formed at its outeredge to provide air circulation for the motor. The rotor core has axialopenings 42 to conduct air from the Ventilating openings 28 to theimpeller. Radial discharge openings 43, Fig. 7, extend through thehousing wall at points between the coils. A bearing head the bearingbushing 46 is held in concentric relation to the housing by the annularrib 47. Studs 48,.imbedded in the insulation, and nuts 49, hold the headin place. Oil holes 51 and 52 are provide through which to lubricate thebearings, and small holes 50 extend through the head to the interior ofthe motor.

From the foregoing description and drawing it will be seen that byarranging the end turns of the coils in the peculiar manner shown anddescribed then molding the end wall of the housing to include them, aconsiderable saving inthe length of the motor is eiected. Also becauseof the fact that there is no commutator-or brushes and no windin on therotor which need be insulated an because the stator windings arecompletely enclosed in an impervious wall of insulation the motor is notless effective because of the Ventilating openings in the housing, forwater may be poured in the openings 28, and, outside of retarding themotor speed temporarily until the water runs' through, no ill effect maybe noticed.`

Having thus shown and described an embodiment of my invention,

I claim,

1. A dynamo electric machine stator comprising, a core having a centralrotor opening and a plurality of spaced apart winding apertures aroundsaid central rotor opening, coils of insulated Wire in said windingapertures, the end turns oi said coils at the one end of the core beinglaid one above the other so as to clear said central rotor opening an atthe other end of the core being laid side by side and extending acrosssaid central rotor opening so as to substantially close the saidopening.

2. A dynamo electric machine stator comprising, a core having a centralrotorvopening and a plurality of spaced apart winding apertures aroundsaid central rotor opening, coils of insulated wire in said windingapertures, the end turns of said coils at the one end of the core beinglaid one above the other so as to clear said central rotor opening andat the other end of the core being laid side d end and closed at theother,

by side and extending across said central rotor opening so as tosubstantially close the said opening and a mass of impervious insulationextending through and about the core and coils and forming a housingopen at one end and closed at the other, said coils being completelyenclosed and hermetically sealed Iin the walls of said housing, the endturns at the one end of the core being contained in the side walls ofsaid housing and the end turns at the other end of the core beingcontained in the end wall of said housing.

3. A dynamo electric machine stator comprising, `a core having a centralrotor opening and a plurality of spaced apart winding apertures aroundsaid central rotor opening, coils of insulated wire in said windingapertures, the end turns of said coils at the one end ot the core beinglaid one above the other so as to clear said central rotor opening andat the other end of the core being laid side by side and extendingacross said central rotor opening so as to substantially close the saidopening and a mass ot imperivous insulation extending through and aboutthe core and coils and forming a housing open at one end and closed atthe 'other, said coils being completely enclosed and hermetically sealedin the walls of said housing, the end turns at the one end of the corebeing contained in the side walls of said housing and the end turns atthe other end of the core being contained in the end wall of saidhousing, said .side walls having radial openings extending therethroughbetween the said coils, and sald end wall-having axial openlngsextending therethrough between the said coils.

4. A dynamo prising, a core having a central rotor opening and aplurality of spaced apart winding apertures around said central rotoropening, coils of insulated wire in said winding apertures, the endturns o said coils at the one end of the core being laid one above theother so as to clear said central' rotor opening and at the other end ofthe core being laid side by side and extending across said central rotoropening so as to substantially close the said opening and a mass ofimpervious insulation extending through and about the core and coils andforming a housing open at one said coils being completely enclosed andhermetically sealed in the walls of said housing, the end turns at theone end of the core being contained in the sidewalls of said housing andthe end turns at the other end of the core being contained in the endwall of said housing, said side walls having radial openings extendingtherethrough between said coils, and said end electric machine statorcomlll a stator as described in claim 4, a bearing head secured to theopen end of said stator a shaft having rotative bearing at one en insaid bearin head and at the other end in the end wall o said stator, anda squirrel cage rqtlr secured to said shaft to rotate therew1 Intestimony whereof I aix my signature VINCENT G. APPLE.

